Toroidal-poloidal partitioning of plate motions since 120 Ma

Details Toroidal-poloidal partitioning of plate motions since 120 Ma Toroidal-poloidal partitioning of plate motions since 120 Ma

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20..375l&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 5, p. 375-378.

Physics

41

Earth Movements, Plates (Tectonics), Subduction (Geology), Cenozoic Era, Error Analysis, Lithosphere, Mesozoic Era

Scientific paper

The recent evolution of plate tectonics was investigated by examining the history of toroidal-poloidal partitioning of plate motions. Results suggest a significant increase in the ratio of toroidal to poloidal motions postdating 43 Ma, corresponding to an overall decrease in global plate motions. Cenozioc and Mesozoic plate motions appear to be correlated and some significant changes in net rotation of the lithosphere with respect to hotspots since 120 Ma were found. Observed temporal changes were preceded by an intense period of mantle plume activity which may cause more dominantly divergent plate motions. Results indicate that recent plate motions may not be a reliable guide to more vigorous regimes of plate tectonics in the past.

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